Any advice

I’ve had depression before, then a girl made me happy for a month now it’s back and even worse. I have friends and hang out with them every weekend but I still feel lonely as shit, like I just feel like shit constantly, I don’t even know if it’s entirely about the breakup. I’ve had fucked up thoughts recently, not like suicidal thoughts but just horrible thoughts. I really don’t know what to do going forward as I’ve tried to improve myself in every way possible besides school because I have no motivation to do anything. But none of any the improvements ived made have made me feel better like I thought they would.